Definitely offer the support and feel of the full memory foam as opposed to my old mirracoil with memory foam top. For myself and girlfriend olwho sleep on our side a lot it's much more comfortable. 
When one of you roll over to get out of bed you won't be woken as I now find she has gotten up before me without having realised. I do wish it was deeper although not saying I'm falling through it I feel it could be a couple inches thicker.